The "Land Rider" bicycle.

For the ultimate in comfort, they’re a bit harder to transport but long-wheelbase recumbents are said to be best.
One cheaper ($1000) one getting high owner remarks is the Cycle Genius LTX: http://www.cyclegenius.com/ltx.htm

The Rans crank-forward bikes are getting good comments too–but they do cost more money. My local shop has a Cruz for $700 IIRC, and I think it’s the cheapest of the lot, and it might be a previous-year-model–already discounted.

To be fair, I own a Sun Speedster CX:
http://www.sunbicycles.com/03/html_04/recumbents/ezspeedster_sx.html
My last upright road and MTB bikes both cost around $1500 each. This bike cost around $1000, and is much more comfortable to ride.
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